Analysis of optimum FBG configurations in DPSK and DQPSK systems

• Main Authors: Go, Yun Ii, Thio, Gilbert Tzer Hwai*
• Format: Book Section
• Published: IET 2014
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.intimal.edu.my/997/; http://ieeexplore.ieee.org/document/7141241/
• Institution: INTI International University

This paper presents the optimization of fiber Bragg grating (FBG) configurations for systems implemented with two modulation schemes: differential phase shift keying (DPSK) and differential quadrature phase shift keying (DQPSK). This paper investigates the possibility of applying a new FBG configuration based on standard spread spectrum sequences. Phase encoding using FBG is applied in both systems. Two design parameters of the encoding schemes are evaluated: code weight and chip length. The system performance is evaluated from three key aspects: modulation scheme, signal-to-noise ratio (SNR) and transmission distance. A comparative study on different FBG configurations is also outlined. This work eliminates the requirement of wavelength conversion and fiber delay lines (FDL). The optimal solution is evaluated in a four-user system considering various noise sources and non-linear effects.